The good news: Plenty of other available solutions can help and, in many cases, may provide even more relief than peptides promise
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Vitamin D3 You can obtain Vitamin D from sunlight
Cells import cystine from the blood, reconvert it to cysteine (likely using ascorbate as cofactor), and from it synthesize GSH
(9) Loren Pickart, Jessica Michelle Vasquez-Soltero, and Anna Margolina (2017) The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline -Brain Science, 2017 Feb 15, Volume 7 (Issue 2), Page 20
Introduction Neurodegenerative diseases are a heterogenous group of neurological disorders characterized by the progressive loss of selective neuronal populations in the nervous system, giving rise to distinct clinical features, such as cognitive, behavioral, and motor symptoms (Agrawal, 2020)